Which device converts digital data into analog signals at the sender and back into digital data at the receiver?

1. Computers store and process data as 0s and 1s, but transmission media carry analog signals. 2. A modem is a device used for conversion between analog signals and digital bits. 3. At the sending end it modulates, turning digital data into an analog signal. 4. At the receiving end it demodulates, turning the analog signal back into digital data. 5. A repeater only regenerates a weakened signal; a switch and a gateway forward packets rather than converting them. _Source: syllabus Computer Science Class 12, Ch 10 'Computer Networks', S10.4.1 Modem_